Ozone-Science & Engineering《臭氧：科学与工程》（双月刊）. The only journal in the world that focuses on the technologies of ozone and related oxidation technologies, Ozone: Science and Engineering brings you quality original research, review papers, research notes, and case histories in each issue.

Outlook on Agriculture《农业展望》（季刊）. Outlook on Agriculture is a peer reviewed journal, published quarterly, which welcomes original research papers, research notes, invited reviews and commentary for an international and interdisciplinary readership. Special attention is paid to agricultural policy, international trade in the agricultural sector, strategic developments in food production, the links between agricultural systems and food security, the role of agriculture in social and economic development, agriculture in developing countries and environmental issues, including natural resources for agriculture and climate impacts.

Otology & Neurotology《耳科学与神经耳科学》（一年10期）. Otology & Neurotology publishes original articles relating to both clinical and basic science aspects of otology, neurotology, and cranial base surgery. As the foremost journal in its field, it has become the favored place for publishing the best of new science relating to the human ear and its diseases. The broadly international character of its contributing authors, editorial board, and readership provides the Journal its decidedly global perspective.

Otolaryngology-Head and Neck Surgery《耳鼻咽喉头颈外科》（月刊）. Otolaryngology–Head and Neck Surgery (OTO-HNS) is the official peer-reviewed publication of the American Academy of Otolaryngology–Head and Neck Surgery Foundation. The mission of Otolaryngology–Head and Neck Surgery is to publish contemporary, ethical, clinically relevant information in otolaryngology, head and neck surgery (ear, nose, throat, head, and neck disorders) that can be used by otolaryngologists, clinicians, scientists, and specialists to improve patient care and public health.

Otolaryngologic Clinics of North America《北美耳鼻咽喉科临床》（双月刊）. Otolaryngologic Clinics of North America updates you on the latest trends in patient management; keeps you up to date on the newest advances; and provides a sound basis for choosing treatment options. Each issue focuses on a single topic in otolaryngology and is presented under the direction of an experienced guest editor.

Ostrich《鸵鸟》（季刊）. Ostrich: Journal of African Ornithology is the leading ornithological journal in Africa, and publishes peer-reviewed scientific papers and short communications (<2,000 words) on all aspects of ornithology conducted in Africa and its associated islands and marine habitats.

Osteoporosis International《国际骨质疏松症》（月刊）. An international multi-disciplinary journal which is a joint initiative between the International Osteoporosis Foundation and the National Osteoporosis Foundation of the USA, Osteoporosis International provides a forum for the communication and exchange of current ideas concerning the diagnosis, prevention, treatment and management of osteoporosis and other metabolic bone diseases.

Osteoarthritis and Cartilage《骨关节炎与软骨》（月刊）. Osteoarthritis and Cartilage is the official journal of the Osteoarthritis Research Society International. It is an international, multidisciplinary journal that disseminates information for the many kinds of specialists and practitioners concerned with osteoarthritis.

Osaka Journal of Mathematics《大阪数学期刊》（季刊）. Osaka Journal of Mathematics is published quarterly by the joint editorship of the Department of Mathematics, Graduate School of Science, Osaka University, and the Department of Mathematics, Graduate School of Science, Osaka Metropolitan University and the Department of Pure and Applied Mathematics, Graduate School of Information Science and Technology, Osaka University with the cooperation of the Department of Mathematical Sciences, Faculty of Engineering Science, Osaka University. The Journal is devoted entirely to the publication of original works in pure and applied mathematics.

Oryx《羚羊》（双月刊）. Oryx—The International Journal of Conservation is a bimonthly, peer-reviewed, open access journal of biodiversity conservation, conservation policy and sustainable use, and the interaction of these subjects with social, economic and political issues. The journal is interdisciplinary and has a particular interest in material that has the potential to improve conservation management and practice. Oryx supports the publishing and communication aspirations of conservation researchers and practitioners worldwide and helps build capacity for conservation. Besides research Articles and Short Communications, Oryx regularly publishes Reviews, Forum Articles, Book Reviews and Letters, and every issue includes a selection of international conservation news.